Check for picker-sticks



D. N. HUNT.

CHECK FOR PICKER STICKS.

APPLICATION FILED 0503,1917.

1,356,366. Patented bet; 19,1920.

' picker. For these-purposes, my invention UNITED STATES PATENT OFFICE.

DAVID N. HUNT, OF ATLANTA, GEORGIA, ASS-IGNOR OF ONE-HALF TO 3'. :MALLORY HUNT, OF FULTON COUNTY, GEORGIA. I

CHECK FOB PICKER-STIGKS.

Specification of Letters Patent.

Application filed December 3, 1917. Serial No. 205,155.

To all 107mm it may concern.

Be it known that I, DAVID N. HUNT, a cltizen of the United States of America, and a resident of Atlanta, Georgia, have invented certain new iand useful. Improve,- ments in Checks for Picker-Sticks, of which the following is specification.

The object of this invention is to provide a construction whereby the picker stick used in looms may be properly arrested at the opposite ends of its stroke. This requires that the arrestation be made without any torsional tendency upon the stick, and that the motion possessed by the stick be gradually arrested and the stick brought to rest at a fixed point on each stroke. for the shuttle should be sharply delivered by the stick before any twisting movement has taken place in the latter, in order to prevent defects in the weaving, and to permit the use. of an open shuttle box, and that the stick,

itself should be brought gradually to rest at a fixed point, without twisting to prevent strain on the stick, and to prevent the lengthening at the successive strokes of the consists in a sliding frame in which the picker stick vibrates, the frame being pro vided with abutting stops to fix a positive limit of movement for the picker stick, and

being provided with friction devices by which its sliding motion is controlled, in such a manner that an increased retardation is afforded to the frame as it reaches the end of its movement under the driving power of the picker stick as the latter approaches the end of its movement, the mounting of the frame being such that it is caused to move in a straight line. without twisting or warping, whereby the checking of the picker stick is effected without twisting of the latter. It further consists in the construction, arrangement and combination of the several parts of which it is composed, as will be hereinafter more fully described and claimed. I

Figure 1 is an elevation of a portion of a picker stick, and its frame constructed in accordance with this invention.

Fig. 2 is a section through the picker stick frame,

Fig. 3 is a section at right angles to the section of Fig.2. I

A block 1 has its one end secured to a lay 2 of the loom, being so shaped as to properly fit thereon, it being fastened thereto in any suitable manner as by a bolt 3. A trans verse channel t is formed in the forward face of the opposite and projecting end of such block, in which channel is mounted, with a sliding, fit the bar 5. By preference the block 1 and bar 5 are made of suitable wood, such aslhickory, although other materials having the desired properties may be used. As will be seen from Fig. 2, the bar 5 has its forward face struck in an are so that the thinnest portion .of such bar is in the center. The bar itself is provided at'its middle portion with a slot 6 arranged lengthwise of the bar, suitable buffer blocks 7 being inserted in the ends of the slot.

The bar is held in the channel 4 by a cap 8, preferably of metal which is drawn toward the forward faceof the bar by a bolt 8 passing through the slot 6 and the block, and by a spring 9 on the rear end of such bolt, a friction washer 10 preferably of leather or fiber being interposed between the. bar and the cap. By this construction, the bar is permitted to slide lengthwise in the channel and in order to prevent its binding at the ends of such motion, the shoulder formed by the head of the bolt 8 is arc-v Patented Oct. 19,, 1920.

the spring is secured, may be locked in angular position by a cotter pin 13. It will be understood that the adjustment of the nut and the adjustment of the tension of the spring efi'ected thereby, affords a means for adjusting the frictional resistance offered to the sliding movement of the bar in the block,

and that this resistance increases toward the ends of the movements of the bar, due to the arc-shape given to the bar.

Mounted in front of the bar, is a strap 14, of any desired material, but preferably of metal. Angular (shown as rectangular) buffer blocks 15, preferably of rubber, are interposed between the ends of the bar and of the strap, being held in place by bolts '16 which also serve to hold the strap in place.

The picker stick 17, driven in any suitable manner, plays behind the strap 14 and in front of the bar.

It will be noted, with the bar at one end of its movement, in which position it has been left by a motion of the picker stick in the same direction, that, as the picker stick approaches its limit of movement in the other direction, it contacts with the corre sponding' buffer block 15, and starts the bar in motion toward its opposite limit of movement. This movement of the bar will be resisted by the friction attendant on the motion of the bar in the channel of the block 1, due to the pressure upon the sliding; parts created by the spring 9. As the bar approaches the end of its movement, this resistance will be increased by reason of the increased tension placed upon the spring; due to the concave face of the bar. This results in a gradual increase of resistance to the movement of the picker stick, and the latter will be finally arrested by the contactof the buffer blocks 7 in the channel 4 with the bolt, 8

Considering the resistance offered to the movement of the bar, the picker stick will, on contacting with the buffer block 15, have its velocity somewhat reduced, and the shuttle will be sharply delivered at this time, after which the picker stick will continue its motion, carryingthe bar with it, it being slowed up at the end of the stroke and finally positively arrested as before described. I It will be noted that in any event, the resistance to movement of the picker stick is transmitted to the latter through the contact of the stick with a face substantially at right angles to its line of motion, whereby torsional strains on the picker stick are prevented; that the stick is not restrained by the frame in regard to its movement at right angles to the length of the bar, and that the bar is guided for rectilinear movement in the block 1. Therefore, in arresting the motion of the picker stick, it is not subjected to side strains tending to twist it or to cause it to wabble in the plane of its vibratory movement, which is of importance. It will be further noted that positive stops are provided for the picker stick, and that these stops are separate and distinct from the means for retarding or slowing down the movement of the stick, and that the latter means may be adjusted without affecting the positive step limits, the positive stops being formed by the buffers.

The buffer blocks 15 receive the initial shock of the picker bar, and are the parts most subject to wear, and by making them angular when one face thereof has been battered, they may be shifted through a given angular movement, and a fresh face presented.

It will be obvious that a check such as before described may be by variations of proportions and size and of parts may be applied to the several variety of looms, without departing from the essential features of this invention.

Having thus described the invention what I claim, and desire to secure by Letters Pat ent is,-

1. A check for picker sticks, including in combination with a support, a bar having a limited right line movement-thereon, friction means retarding the movement of the said bar with an increasing resistance toward the limits of such movement in both directions, and a picker stick limited in its vibratory movement by the movement of the bar.

2. A. check for picker sticks. including in combination with a support, a bar moving thereon. the bar having an opposite flat and concave face, by the former of which the said bar is guided for right line movement, spring-pressed means bearing on the concaved face of the said bar for restraining the movement of the bar on the said support, and a picker stick limited in its vibratory movement by the movement of said bar.

3. A check for picker sticks including in combination with a lay having a support provided with a channel, and a picker stick, a slotted bar mounted in said channel, said bar having a concaved exposed face, an areshaped friction-member bearing: on the concaved face of the said bar, a spring: pressing the said friction member against said face for imparting increased resistance to limit the vibratory movement of. said picker stick, and buffer stops on the bar for arresting the movement thereof.

4. A check for picker sticks, including in combination with a lay having a support, and a picker stick; of a bar carried by said support and adapted for right line movement thereon, said bar having a concaved face, and a friction device bearing on the concaved face of the said bar for imparting increased resistance thereto to limit the vi bratory movement of said picker stick.

5. A. check for picker sticks, including in combination with a lay having a support, and a picker stick. a bar carried by said sup port and adapted for right line movement thereon, said bar having a concaved face, a

friction device bearing on the concaved face of the said bar for imparting increased reslstance thereto to limit the v1bratory movement of said picker stick, and bufier stops on the bar for arresting the movement thereof.

6. The combination with a picker stick, of a check therefor including a slidably supported means engageable by the picker stick in its vibratory movement for limiting the movement of the picker stick in both directions, and means for frictionally retardin the movement of the said slidably supporte 10 means with an increasing resistance toward the limits of said movements.

In testimony whereof I have hereunto set my hand.

DAVID N. HUNT. 

